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Different Methods to find Prime Numbers in C#
The following are the two ways through which you can find a prime number in C#.
Check Prime Number using for loop
using System;
namespace Program {
class Demo {
public static void Main() {
int n =7;
int a;
a = 0;
for (int i = 1; i <= n; i++) {
if (n % i == 0) {
a++;
}
}
if (a == 2) {
Console.WriteLine("Prime Number");
} else {
Console.WriteLine("Not a Prime Number");
}
Console.ReadLine();
}
}
}Output
Prime Number
Check Prime Number using a function in C#
using System;
namespace Program {
class Demo {
static void Main(string[] args) {
int n = 7;
int res = primeFunc(n);
if (res == 0) {
Console.WriteLine("Not a prime number", n);
} else {
Console.WriteLine("Prime number", n);
}
Console.Read();
}
private static int primeFunc(int n) {
int i;
for (i = 2; i <= n - 1; i++) {
if (n % i == 0) {
return 0;
}
}
if (i == n) {
return 1;
}
return 0;
}
}
}Output
Prime number
Updated on: 23-Jun-2020
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